Share-Based Compensation (Details) - USD ($) $ in Millions |
Sep. 30, 2021 |
Dec. 31, 2020 |
Sep. 30, 2020 |
Apr. 16, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||
| Number of shares authorized | 1,045,000 | 1,550,000 | 1,550,000 | 6,845,297 | 2,500,000 | 2,475,000 | |
| Awards outstanding | 60,000 | 950,000 | 1,125,000 | 500,000 | |||
| Performance hurdle value | $ 500 | $ 294 | |||||
| Minimum | |||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||
| Performance hurdle value | $ 294 | $ 120 | |||||
| Maximum | |||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||
| Performance hurdle value | $ 900 | $ 300 | |||||
| Equity Incentive Plan | |||||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||
| Number of shares authorized | 6,845,297 |
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- Definition The amount of performance hurdle value. No definition available.
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Number of shares authorized for issuance under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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